- "I'd hate to think heaven looks like this."
"Who says we went to heaven?"" - ―Daniel Jackson and Rodney McKay[src]
The concept of an afterlife is a belief that an individual's consciousness, or soul, will continue to exist after his/her physical death. A number of Tau'ri believed that they would end up in heaven or hell after death, depending on their actions in life. (SG1: "The Nox", "Demons")
The Jaffa believed that they would reside in a place called Kheb after their death if they were loyal to their "god" as well as Shol'va will suffer eternal damnation for their heresy. (SG1: "The Serpent's Venom", "Revelations")
Ascension may more practically be called an "afterlife" as the bodies of an ascended individual ceases to exist while their consciousness persists in a higher plane. (SG1: "Ascension")